Hammer for rotary mills.



.2 SHEETS-SHEET l.

G @wf/@wf /17/7/0/7 FM4/Mm M. F. WILLIAMS. HAMMER FOR ROTARY MILLS.

APPLlCATlON FILED IUNEYZS, 191?.

Patented May 21,1918.

2 SHEETS-SHEET 2.

Landsat. y

nILron WILLIAMS, or` Sr. Louis, Ivi'z'isso'nni, AssIGnonro WILLIAMSramener cnUSIIER Ann ruLvrenIzEn COMPANY. or Sr. Louis, MISSOURI, Aooiaeonarroiv or MISSOURI.`

' HAMMER, ron ROTARY MILLS.

Specification of Letters Patent. Patmnted 1W ly 2m, ai.

. appiicatiiraied June 25,1917. Seriaino.176,75s.

To ahioiomt concern:

Be it, known that l.' MII/rox F-.VILLIAMS,

a citizenI of the UnitedStates. residing at` .the city of StiLouisiState ofMissouri, have Invented. a certain new and usefulImprovenient in Hammers, for Rotary hflills,` of which thev following isa full. clear. and exact description., such as will enableot-hersskilled in the art to .which it appertains to make and l nsethe same,`reference being had to the ,ac-

. conipaiiying drawings, forming part of this "fvfiousor'pointe'd outhereinafter, reference'- being had to' the' accompanying drawings, in

specification. .l i This invent-ion relates generally to rotar-y millsof ya t- Vpe inconimon use for the crush.

ing. shredding, grinding, or coinminuting Avof a great Variety ofmaterials. In a more specific aspect. the invention relates to cer tainimprovements in thefhaminers or beaters for use in such mills. i

The objects of the invention comprehend the. provision of an'improvedforni of beater or hammer which is so designed as to give a maximumlongevity or seryiceability with a uniform and consistent eiiiciencythroughout its life. By the provision ofsuch an instrument, thisinvention accomplishes a decided increase in theeconomy and e-ii`ciencyof; operating machines of the class specified.` Otherob'je'ctsof'the invention'will be ob- .Figure 1 represents f a longitudinal; sec!tional lelevation'of a Irotary mill` orl grinder equipped with lmyimproved hammers or beaters; 1

Fig." Qreprese'ntsa-side elevation of' my improved hammerorbeater;

Fig. 3 represents'a: frontelevation thereof. Making reference to theseillustrationsby means of the numerals applied, let it be niiderstood'that 1 represents generally a frame" or casingI which forms a` support.and inclosure for the workingparts of a rotary linill; This millincludes a cage .or screen 2 disposed c'oiicentrically with an operatingshaft-4f. upon which shaft are mounted disks or hammer n'iounts 5 in.which the hammers Gare pivotally:[mounted on pivot bolts: 7.

lln the illustration. the hammers 'are shown iii the positionswhichfthey occup v." tlieoreti ciillv when the machine' isiii'operation.they being held out radially ofthe shatti by the 5,5 .centrifugal forceijeslltl'ting. from their niomentum and inertia accruing upon the rotation of t-he sha-ft 4. The vcage 2 forms a cylinder in which therotary menibersjust described are adapted to operate, and in the forniof machine illustratedIthe material to be reduced is fed into thecylinder by the operation of, feeding rollers 8 which are rotated tomove the material into the .cylinder across a breaking or cutting plate9. As the material is thus fed intofthe cylinder while the shaft 4 isrotating to .drive the .lia-miners in the direction indicated by thearrow, the hammers will be brought successively upon the material, andby virtue of the coactioiipieces as are not sutiiciently smallto passthrough the interstices of the cage '2 will be subjected to the furtheraction of the beaters or hammers in coaction with the portions of thecage until such pieces are further coniininuted to the requisite size orineness.. This is the well known operation of mills of this type, andi-t is the utility of in v inven. tion to contribute to the.eii'ectiveness and the economy of this operation.

It will be seen by reference to Figs. 2- and 3 that the hammer or beaterwhich coin-l prises iiiy invention is formed of al Hat .bar of metalwhich is shaped to provide a shank portion 10 which terminates at oneend in a y pair of oppositely extending working points which aredesignated respectively` 11 and 11. Adjacent its other extremity theshank portion 10 is provided with an aperture l2 which isadapted toaccommodate the pivot bolt upon which the hammer is vto be swung. l'Thearrangement of this mounting mea-ns is such that the hammer is adaptedto swingedgewise with either one or the other of the working points 11or 11 in advance. Each of the working points hasl an inner margin 1i andan outer margin 15 extending to a front margin 16. Tlfe outer margin 15is of somewhat greater extent than the inner margin 14. so that at. the

4junction of the outer margin andthe front size, eii'ectivelvl balance'thelhammer so .as a5' maybe displaced from the inner margins of thepointy members, and. from the `portion 1S intermediate the Vpointmembers, so as to form these point members somewhat thicker than theshank portion, as is apparent inv Fig. 3. e i

It has, been `described abovehow in the Ordinaiy""operation'of amachine, of this type, the beaters coperate with the breaker plate andwith the cage. The continuous operation of beaters in a'maeliine of thiskind resultsin a" wearing down of their working 'edgesduc tothej'abrasion and attrition 'of the material upon which they operate.'-In lig, Ihave indicated by a dottedflinemarked "1c`;`the formto whichthe working point ymay be worn down in time. Ai.v lian'imerso `worn, ofcourse, has greatly reducecleiiicienc'y, as it is not so effective tosevei'the, `materialonthe breaker plate or' stood' that `thetwo .workingpoints 11 and'y 11, being'practi'cally identical inform and to make lithold thetrue'radius when in operati-on, and the reversal of the hammersrin the manner speciiied-,fkeeps the wear equalized on .thetwol point`members. When the second pointmei'nber has been worn down, the hammersmaybe removed/from the mill, and"the-front margins of the point membersground rback to the form illustrated by Vthe' dotted line 'marked g.*rl-hue, it will be seen that ei'itirelynew`working 'edges and facesareprovided 'onbotlr of' the point members,and the -point 'members are leftat substantially uniform size' andfshape, so as to'maintain the balanceofthe "hammer, 'Attention was directed above tothe fact that the outer.margins 15 of the' working points are disposed substantially 'on' thearcyof theI cage. Consequently, the newworking edges formed by thedressingdown of the working points will been the same radius relative tothe shaftgor the same arc, as lwere the original edges/In thisfashion'the proper spacial relationship of the working- ,edges with the'breaker plate and cage ismaintained. and the efficiency of Ithe mill iskept at its highest point. U on thecontinuous operation'of th'einill anwear of the hammers` this` manipulationor reversal of the hammers 'andgrinding l'down otvthe working I lpoints is repeated. the workin-'gpoints being gradually dressed back'in4 the-formI illustrated bythesuccessive dotted lines in Fig. 2. It will be observed that in all ofthese forms the workin-g edge is maintained substantially on-the samearc..

It will be observed that by virtue of this construction, the hammershave avery long life without any decrease in their effectiveness, andthat the proper balance of the hammer is maintained"throughout its lifeso that it will operate upon the proper radius as well as upon thepropei` arc. The forming of'the point members inthe manner abovedescribed not only increases their densityv and contributes to theirdurability, but also increases their eifective extent, as will beobvious upon inspection of Fig. 3 wherein the relative disposal ofadjacent hammers is shown, and from which it' will be observed thatthe/effective working edges overhang the greater portion of the spaceintermediate the hammers occasioned by the interposition of the mounts5.

I am aware thatthe device is susceptible of certain modifications andchanges which "I have not described herein or specifically referred to.Accordinglv, it is my intention'that the appended claims be construed tocomprehend such variations.

l, the mills cage` and said working points having'inner margins andfront margins ex tendingfrom'said inner margins to the outer margins'andforming working edges at their lines of junction with the outer marginson the eii'ective radius ot the hammer.

2L In a rotary mill. ahaminer formed of fa flat-b arwh'ich isbilaterallv symmetrical and equipped' for suspension on itsylongitudinal axis adjacent one extremity. the other extremity of the barbeing formed into oppositely projecting working points having theirouter kmargins extending bevond the front and rear margins of the shankand disposed'siibstant-ially on the arc ofthe mills concave. saidworking points being formed also'with inner margins and front marginsextending from the same to the outer margins and terminating at theiroutermost Ixtremities in working edges extending in he direction of thebars thickness.

In a rotary mill.' a hammer formed ot a flat bar-equipped yadiacent oneextremity on its longitudinal' axis tor suspension on an operatingshaft. and torinedl at its other extremity linto similar oppositelvdirected working poi-nts extending outwardly a substantial distance in'advance ofthe front and eeeeeee meer margins-.of the ber, the outermergins at front nmfginswhlei-fform working edges 15Vy of which .Werkingpoints form the termmal at their junctions with ,the outermer i'ns. edgeof the hemmeham throughout the por- In testimony whereof I hereunto e 'xmy tionshereof which exted beyond the liront signature this 220th day ofJune, 1917 and reen: merginsof the shank portion. are

disposed substentiay in acom'mon are deu 'MILTON F WHLLM'IISv serxb one. radius' 'from the exis 'of'the Witnesses:

qpemtingf eheft, both the outer and inner ELLIoTr S. HAUSER,

margins 'of Worldng points terminating M. PLAISTED.

